High-resolution dynamic computer simulation of electrophoresis using a multiphysics software platform

Induced spinodal decomposition under electron irradiation in a Ni-Au alloy has been investigated with respect to its basic mechanism and confirmed to be caused by the relaxation of coherent strain associated with modulated structure. Modulation of white-dots on structure images of modulated structure due to high-resolution electron microscopy is reduced with irradiation. In this paper the atom arrangement of the modulated structure is confirmed with computer simulation on the structure images, and the relaxation of the coherent strain is concluded to be due to the reduction of phase-modulation.Structure images of three-dimensional modulated structure along <100> were taken with the JEM-4000EX high-resolution electron microscope at the HVEM Laboratory, Kyushu University. The transmitted beam and four 200 reflections with their satellites from the modulated structure in an fee Ni-30.0at%Au alloy under illumination of 400keV electrons were used for the structure images under a condition of the spherical aberration constant of the objective lens, Cs = 1mm, the divergence of the beam, α = 3 × 10-4 rad, underfocus, Δf ≃ -50nm and specimen thickness, t ≃ 15nm. The CIHRTEM code was used for the simulation of the structure image.

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Concept development for the optimisation of the Hamburg Wastewater Treatment Plants

Water Science & Technology ◽

10.2166/wst.2000.0177 ◽

2000 ◽

Vol 41 (9) ◽

pp. 89-95 ◽

Cited By ~ 2

Author(s):

G. Ladiges ◽

N-P. Bertram ◽

R. Otterpohl

Keyword(s):

Computer Simulation ◽

Wastewater Treatment ◽

Simulation Study ◽

Storage Capacity ◽

Wastewater Treatment Plants ◽

Concept Development ◽

Final Solution ◽

Effluent Standards ◽

Dynamic Computer Simulation ◽

Traditional Manner

The Hamburger Stadtentwässerung (HSE) is planning to take on a further approximately 250,000 PE in addition to the 1.85 m PE already served by its combined wastewater treatment plants at Köhlbrandhöft/Dradenau. To cope with the increased load, a concept for the extension of the plants had to be developed. Various concepts were compared and evaluated using a dynamic computer simulation. The very wide-ranging simulation study showed that the required effluent standards can still be achieved after the volume of the sludge liquor storage capacity has been increased. As many concepts had been assessed in detail, the final solution chosen was considerably less expensive than if the wastewater treatment plants had been extended in a traditional manner.

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Efficient Dynamic Computer Simulation of Simple-Closed Spatial Linkages

16th Design Automation Conference: Volume 2 — Optimal Design and Mechanical Systems Analysis ◽

10.1115/detc1990-0094 ◽

1990 ◽

Author(s):

L. T. Wang

Keyword(s):

Computer Simulation ◽

Computational Algorithm ◽

Equations Of Motion ◽

Joint Space ◽

Kinematic Chains ◽

Spatial Linkages ◽

Dynamic Computer Simulation ◽

The Stability ◽

Coordinate Partitioning ◽

Generalized Coordinate

Abstract A new method of formulating the generalized equations of motion for simple-closed (single loop) spatial linkages is presented in this paper. This method is based on the generalized principle of D’Alembert and the use of the transformation Jacobian matrices. The number of the differential equations of motion is minimized by performing the method of generalized coordinate partitioning in the joint space. Based on this formulation, a computational algorithm for computer simulation the dynamic motions of the linkage is developed, this algorithm is not only numerically stable but also fully exploits the efficient recursive computational schemes developed earlier for open kinematic chains. Two numerical examples are presented to demonstrate the stability and efficiency of the algorithm.

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